Replacement solution between tranditional lamps and LED

　　Many people mention "efficiency" of LED lights when discussing their output per Watt. The correct term is "efficacy" because we are dealing with power in (Watts) vs. Luminous Flux out(Lumens).

　　In any case, the higher the efficacy the more light we are getting for the energy we are using. Cool White LEDs have a higher efficacy than Warm White LEDs, because the Warm White LEDs use more phosphors, which absorb and re-emit the light in a warmer wavelength.

　　Efficacies of various light-sources are shown below:

　　So if you want to replace tranditional lamps, please care about total lumens of lamps.

　　for example,if you want to replace 70w Halogen lamps,you can choose 7w led with cool white or 8w led with warm white.